
Source: 1860s, Evidence as to Man's Place in Nature (1863), Ch.2, p. 120
Source: 1860s, Evidence as to Man's Place in Nature (1863), Ch.2, p. 115
Source: 1860s, Evidence as to Man's Place in Nature (1863), Ch.2, p. 120
Source: What Every Girl Should Know (1913), Chapter 4, "Sexual Impulses--Part II", p. 47.
Source: 1860s, Evidence as to Man's Place in Nature (1863), Ch.2, p. 101
Source: 1860s, Evidence as to Man's Place in Nature (1863), Ch.2, p. 110
[Chapter X, Living Philosophies, 149, 1931, Simon & Schuster]
Part I, Chapter 17, Experiments in Dietetics
1920s, An Autobiography (1927)
Source: Self-Help; with Illustrations of Character and Conduct (1859), Ch. X : Money — Its Use and Abuse
Speech to the Cambridge University Aeronautical Society, April 1925 in Trenchard, Man of Vision (1962) p. 519